Fat Worm Blows a Sparky is an action / maze video game written by Julian Todd in the five months before going to University and published by Durell Software in 1986 for the ZX Spectrum.

The player controls Fat Worm, a microscopic worm being chased across the circuit board of a Sinclair Spectrum. With a top-down view, Fat Worm featured early use of solid vector graphics on the ZX Spectrum.